通过对白僵菌不同方面的生物学特征进行比较筛选，认为酯酶同工酶图谱对菌株的鉴定具有实用价值，并将之应用于林间菌株的检测。释放菌源可在林区冬春季宿存，但未能引起马尾松毛虫疾病流行和大量死亡。林间放菌可掌握下列时机：江南林区，可在３月下旬或６月下旬至７月上旬，最好是在夏季进行；而江淮林区应抓住６～７月多雨季节放菌；具体时间应选择幼虫３龄或４龄初期，最好在雨天间隙、阴天或晴天傍晚进行。 By comparing the biological characteristics of different aspects of Beauveria bassiana, esterase isozyme map is of practical value for the identification of strains and is applied to the detection of forest strains. The release of bacteria could survive in winter and spring in forest area, but failed to cause the disease and mass death of Dendrolimus punctatus. Forest grafting can grasp the following opportunities: Jiangnan forest, in late March or late June to early July, preferably in summer; and Jianghuai forest should catch 6 to 7 months of rainy season bacteria; The specific time should choose larvae 3 or 4 early age, the best in the rainy day gap, cloudy or sunny evening.